.shell-row {
  width: 100%;
  padding-inline: var(--shell-gutter);
}

.skip-link {
  position: fixed;
  top: 8px;
  left: var(--shell-gutter);
  z-index: 100;
  padding: 8px 12px;
  transform: translateY(-200%);
  background: var(--color-shell-background);
  border: 1px solid var(--color-interaction);
  text-decoration: none;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.site-header {
  background: var(--color-shell-background);
  border-bottom: 1px solid var(--color-shell-border);
}

.shell-header-row {
  display: flex;
  align-items: center;
  min-height: 84px;
  gap: 32px;
}

.wordmark,
.footer-wordmark {
  flex: 0 0 auto;
  font-weight: 800;
  letter-spacing: 2px;
  text-decoration: none;
}

.wordmark {
  font-size: 26px;
}

.primary-navigation {
  display: flex;
  align-items: center;
  margin-left: auto;
  gap: 32px;
}

.primary-navigation a {
  position: relative;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.primary-navigation a.is-active::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: calc(-1 * var(--active-nav-offset));
  left: 0;
  height: var(--active-nav-thickness);
  background: var(--color-interaction);
}

.menu-trigger {
  display: none;
  width: 48px;
  height: 42px;
  margin-left: auto;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-shell-border);
  color: var(--color-text-primary);
}

.menu-bars {
  display: grid;
  width: 20px;
  gap: 4px;
}

.menu-bars > span {
  display: block;
  height: 2px;
  background: currentColor;
}

.site-footer {
  background: var(--color-footer-background);
  border-top: 1px solid var(--color-shell-border);
}

.footer-layout {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px 48px;
  padding: 40px var(--shell-gutter) 28px;
}

.footer-wordmark {
  font-size: 24px;
}

.footer-primary-nav,
.footer-legal-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-primary-nav a,
.footer-legal-nav a {
  color: var(--color-text-muted-desktop);
  font-size: 18px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}

.copyright {
  grid-column: 1 / -1;
  margin: 12px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--color-footer-divider);
  color: var(--color-text-muted-desktop);
  font-size: 15px;
}

/* Desktop Footer: >= 940 CSS px */
@media (min-width: 940px) {
  .footer-layout {
    grid-template-columns:
      auto
      minmax(0, 1fr)
      auto;
  }

  .footer-primary-nav {
    flex-wrap: wrap;
  }

  .footer-primary-nav,
  .footer-legal-nav {
    padding-left: 28px;
    border-left:
      var(--footer-separator-width)
      solid
      var(--color-footer-divider);
  }
}

/*
  Compact Tablet Header geometry only.
  IMPLEMENTATION_CANDIDATE_ONLY.
  Canonical Header mode remains full navigation at every width >= 680px.
*/
@media (max-width: 900px) and (min-width: 680px) {
  .shell-header-row {
    min-height: 70px;
    gap: 20px;
  }

  .wordmark {
    font-size: 22px;
  }

  .primary-navigation {
    gap: 20px;
  }

  .primary-navigation a {
    font-size: 17px;
  }
}

/* Tablet Footer: 680–939 CSS px */
@media (max-width: 939px) and (min-width: 680px) {
  .footer-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 34px var(--shell-gutter) 26px;
  }

  .footer-wordmark {
    grid-column: 1;
    margin-bottom: 24px;
    font-size: 21px;
  }

  .footer-primary-nav {
    grid-column: 1;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 26px;
    margin-bottom: 22px;
  }

  .footer-legal-nav {
    grid-column: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 24px;
    margin-bottom: 4px;
  }

  .footer-primary-nav a,
  .footer-legal-nav a {
    color: var(--color-text-muted-compact);
    font-size: 17px;
    font-weight: 500;
  }

  .copyright {
    grid-column: 1;
    margin: 24px 0 0;
    color: var(--color-text-muted-compact);
    font-size: 14px;
  }
}

/*
  Mobile Header: < 680 CSS px
  Mobile Footer: < 680 CSS px
*/
@media (max-width: 679px) {
  .shell-header-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: 66px auto;
    align-items: center;
    gap: 0;
  }

  .wordmark {
    grid-column: 1;
    grid-row: 1;
    font-size: 20px;
  }

  .js .menu-trigger {
    display: inline-flex;
    grid-column: 2;
    grid-row: 1;
  }

  .primary-navigation {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    margin-left: 0;
    padding: 12px 0 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .primary-navigation a {
    font-size: 18px;
  }

  .js .primary-navigation {
    display: none;
  }

  .js .primary-navigation[data-open="true"] {
    display: flex;
  }

  .no-js .primary-navigation {
    display: flex;
  }

  .footer-layout {
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 24px;
    row-gap: 28px;
    padding: 36px var(--shell-gutter) 24px;
  }

  .footer-wordmark {
    grid-column: 1 / -1;
    grid-row: 1;
    font-size: 20px;
  }

  .footer-primary-nav {
    grid-column: 1;
    grid-row: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .footer-legal-nav {
    grid-column: 2;
    grid-row: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .footer-primary-nav a,
  .footer-legal-nav a {
    color: var(--color-text-muted-compact);
    font-size: 18px;
    font-weight: 500;
  }

  .copyright {
    grid-column: 1 / -1;
    grid-row: 3;
    margin: 0;
    color: var(--color-text-muted-compact);
    font-size: 14px;
  }
}
/* Wide-screen containment: align the frozen shared shell with the 1440px site canvas. */
@media (min-width: 1441px) {
  .shell-header-row,
  .footer-layout {
    width: 100%;
    max-width: 1440px;
    margin-inline: auto;
  }
}